by: 
<% song.artists.each_with_index do |artist, index| %>
  <span id="song-artist-<%= artist.id %>">
    <%= (index == 0)? "" : "&" %>
    <%= link_to artist.name, artist %> 
    <span class="remove-artist">
      <%= link_to_remote 'x', :url => remove_song_artist_links_path(song, :artist_id => artist.id), :method => :delete %>
    </span>
  </span>
<% end %>
<br />
<p><%= link_to 'Add Artist', new_song_artist_link_path(song),
                             :class => 'lightwindow',
                             :params => 'lightwindow_type=page,lightwindow_height=500,lightwindow_width=500' %></p>